Radiation pyrometer



ffPatlelnted May` 28, 1929.

"relajarv omer.'

. CHARLES i-:DWIN ros'rER, o 'F LETGHWOB'JJH, ENGLAND.

lRADIATION rrnoivm'rrxar.v j

i Application led July 9, 1925*, Serialv No. 42,390,211111 in GreatBritainy November 15, 1824.

v This invention relates'to radiation pyrometers such as forinstance' ofthe fixed focus Y type as described in specifications of British f.#Patent-s Nosssoas @H909 and 144,489, and 25 hasV for its object toprovide improved means .l forjprotectingfrom fumes, gases and vapours, 1the' mirror or'A 'equivalent device and the therma-couple or otherdevice therein sensitiveto heat. i f

Heretofore a window transparent to heat radiations has been provided ator adjacent the front aperture of the receiving tube of the fpyr'ometer,at such position it is however f liable to rapid clouding by the actionof dust or fumes.

)The present invention consists of a radiavtion pyrometer of which theradiation receiv- Ving tube is closed at some distance from its lopenend by a transparent Window. This Window completely protects thesensitive porvtions of the instrument from dust and fumes,

j and the instrument'does not need such fre- 'quent cleaning asheretofore. As an additional precaution l'the window itself may be lprotected against clouding by dust and fumes by providing V openings insides of the tube between its open end and the window, such f openingsbeing arranged to admit of cross jif vetilation of the tube.

` Y To facilitate access to this window the tube or housing of thepyrometer may be made of two or more vdetachable portions, one point Vof detachment beingy arranged near the winidow.V e Y Although theinvention is particularly usel' 'ful as. applied to fixedfocus-radiation pyrom- Y f Vveters, it is also applicable to other typesof if" yradiation pyrometers.

method of carrying out the invention is illustrated by Vthe accompanyingdrawings I i wherein-Fig. lis a general view of the pyrometer tube,Fig.V 2 a transversesection through A-'`A,Fig. 1,l and Fig. 3 alongitudinal section of the portion of thetube containing the window. Y

' In these drawingsthe main tube is divided into two portions 2A and 3connected together by a screw joint 4. VIntheopen end portion 2 of vthetube are provided side Ventilating Y openings 5, while in the portion 3of the tube [is provided near its end a transparent winj dow 6. Thewindow 6 is a disc of suitable transparent material detachably held in arrecess ina ring 7 by means of a removable y ,-.spring ring 8, the ring7 being secured inside the tube 3 in any suitable manner nearvthescrewed joint 4. In the example illustrated in the portion 2 of the tubeis provided a. mirror 9 hinged at 10 to one side of thetube in such amanner thatit can be'brought vinto the inclined position under the eyepiece 11, necessary toenable the position of the tube to be accuratelyadjusted. The end of the portion 3 ofthe tube contains a concave mirror12, and at 13 a thermo-electric couple'oi:l which the leads pass downthrough a plug 14 in any suitable manner. Both portions of the tube areprovided with diaphragms or apertures 15, the diaphragm 15 Within thescrew joint 4 being provided with a slot 16 to enable the supportingportion 17 to be turned down against the sides of the tube.

The front portion of the screwed joint 4 also carries a screwed trunnionpin 18 and nut 19 by which the tube can be fixed at the desired angle ina supporting stand.

What I claim and desire to secure by Letters Patent is i 1.. A pyrometercomprising a tube section having an open inner end and a section havvinga closed outer end, and detachable connecting means for said sections, afixed diaphragm window closing the inner end of the section having theclosed outer end, and a thermo-electric couple fixed in the outer end ofsaid latter section.

2. In a pyrometer the combination With a pair of tube sections anda'detachable connection therefor, of a detachable diaphragm windowclosing the innerend of one section and a closure for the outer end ofsa1d section,

fa thermo-electric'couple enclosed nearsaid outer end, and means forventilatingthe interior of the other section. i'

3. In a pyrometer the combination with a pair of rigidly connected,detachable,tubular sections, of a closure'for the outer end of onesect-ion and a thermo-electric couple enclosed v'adjacent said closurefarecessed supporting member near the opposite end of the latter retainingmeans therefor adjacent the inner Vend of the other section, athermo-electric ico couple located adjacent the outer end of the lattersection, and a closure forsaid outer end.

5. A .pyrometer comprisingy a pair ofV alined, joined tube sectionsonecf which has v an open end and side openings, a positioning mirrorenclosed near the inner end of said section and a viewing openingtherefor, a d1aphragin'window closingr the inner end o'fthel othersection, a closure for the outer end of the flatter section, and athermo-electric couple located adjacent said outer end. Y

, 6.v Thecombination'with a tubularpyrometer-section 'having a pluralityofY spaced,

interior, open-center supporting elements, a

mirror closing one end of the section and an v enclosed :thermo-electriccouple adjacent thereto, and detachable diaphragm Window Y i I andretaining means thereforv closing the .Y Y

i Y 2o 7 The combination with a sectional, tubu-V other end of saidsection.

lar, pyrometer and its intermediate connect-V. Y

ing sleeve, of a threaded trunnion and clamp nut Lfor lixing the parts1n adjusted position, a concave mirror closing onevend. of a section andan enclosed thermo-electriccouple adja` side openings.

Y In Witnesswhereofl affix j* Y i vCHARLES VEDVIN FOSTER.` y

